异龙是最大的掠夺性恐龙的晚侏罗纪期间在北美地区。
Allosaurus was the top predatory dinosaur of the late Jurassic period in North America.
晚侏罗纪—早白垩世为拉张断陷盆地，第三纪以来为挤压坳陷盆地。
It was rift basin in Late Jurassic Early Creaceous and squeezed sag basin since Cenozoic.
第三纪和晚侏罗纪时期沉积的弱胶结粉细砂层在我国东北、南地区有广泛的分布。
Weak cemented fine quicksand layer deposited at the Tertiary Period and Jurassic Period is widely distributed in China's northeast and southwest regions.
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